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One-proton and one-neutron knockout reactions from N = Z = 28 56Ni to the A = 55 mirror pair 55Co and 55Ni

Spieker, M., Gade, A., Weisshaar, D., Brown, B. A., Tostevin, J.A., Longfellow, B., Adrich, P., Bazin, D., Bentley, M. A., Brown, J. R. , Campbell, C. M., Diget, C. Aa., Elman, B., Glasmacher, T., Hill, M., Pritychenko, B., Ratkiewicz, A. and Rhodes, D. (2019) One-proton and one-neutron knockout reactions from N = Z = 28 56Ni to the A = 55 mirror pair 55Co and 55Ni Physical Review C, 99 (5), 051304(R). 051304-1.

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We present a high-resolution in-beam γ-ray spectroscopy study of excited states in the mirror nuclei 55Co and 56Ni following one-nucleon knockout from a projectile beam of 56Ni. The newly determined partial cross sections and the γ-decay properties of excited states provide a test of state-of-the-art nuclear structure models and probe mirror symmetry in unique ways. The new experimental data are compared to large-scale shell-model calculations in the full pf space and including charge-dependent contributions. A mirror asymmetry for the partial cross sections leading to the two lowest 3/2 states in the A = 55 mirror pair was identified as well as a significant difference in the E1 decays from the 1/21+ state to the same two 3/2 states. The mirror asymmetry in the partial cross sections cannot be reconciled with the present shell-model picture or small mixing introduced in a two-state model. The observed mirror asymmetry in the E decay pattern, however, points at stronger mixing between the two lowest 3/2 states in 55Co than in its mirror 55Ni.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Physics
Authors :
Spieker, M.
Gade, A.
Weisshaar, D.
Brown, B. A.
Longfellow, B.
Adrich, P.
Bazin, D.
Bentley, M. A.
Brown, J. R.
Campbell, C. M.
Diget, C. Aa.
Elman, B.
Glasmacher, T.
Hill, M.
Pritychenko, B.
Ratkiewicz, A.
Rhodes, D.
Date : May 2019
Funders : Science and Technology Facilities Council (STFC)
DOI : 10.1103/PhysRevC.99.051304
Copyright Disclaimer : © 2019 American Physical Society
Depositing User : Clive Harris
Date Deposited : 15 May 2019 09:54
Last Modified : 31 May 2019 13:38

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